Centrifugal fan



Oct. 23, 1928.

ORNEYS g/mules E [Ii/M241 v NTORS Ja/m liursch J. MURSCH ET AL CENTRIFUGAL FAN Filed Aug. 16, 1927 Patented Oct. 23, 1928.

mm MUBSCI-I AND-CHARLES s. scirnrrn, BUFFALO HAMMER MILL coRroRAcrIoN,

TION or NEW Yonx.

or ,Urrca, 'NEW' YORK, assie vonsl ro, or serra e, NEW YORK, A CORPORA- CENTBIFUGAL FAN.

Application filed August 16, 1927. Serial No. 213,238

This invention relates to improvements in centrifugal advancing mechanism, in' particular to the centrifugal fan used therewith.

It isone of the primary objects of the invention to provide a device of this character which will operate with greater efiiciency and with the requirement of less powsurtaces of these blades and to connect the er than those heretofore in use.

It is a further object to provide a construction which'will operate satisfactorily for a greater period of time by reducing the wear upon the parts thereof.

More specifically the. invention contemplates the provision of improved radial blades extending outwardly and rearwardly from the axis of rotation of the advancing-fan and to provide stepped surfaces on the-contact stepped surfaces of said bladeswith a supporting diskthus forming a rugged constructionand one operatingin a superior manner to prior constructions.

These and other objects will appear more;

fully from which: I

Fig. 1 is an elevational view of a mill showing the application of the invention.

Fig. 2 is an end elevational View of the fan wheel. I Fig. 3 is a vertical View taken at right angles to Fig.2, parts being in section on the line 33 of Fig. 2.

Fig. 4 is a fragmentary section taken on the line el l of Fig. 2.

Thisinvention is useful in connection with a wide variety of mechanisms for advancing roducts, for example with all kinds of grindlng mills such for instance as feed mills, ore or clay or other grinding or advancing mechanisms, the present invention in this respect not being limited to any particular nism but being adapted, with slight changes, to a wide variety of uses.

Referring to the details of the drawings, there is diagrammatically illustrated a portion of a feed mill 6 to which my invention is applied. The advancing mechanism is supported within the housing 8 and is fed adjacent the axis thereof from a suitable conducting pipe 9, the fan or advancing element 11. receiving the material and discharging the same through an outlet pipe as indicated for example at 10. The use and relation of these partswill the following description considered in connection with the drawings in mechaskilled in the art and does not differ from the uses of other centritugal advancing de vices. v

The centrifugal mechanism includes a sup- I porting disk 12 formed with a central hub portion 14 adapting the same to be upon any suitable rotatable shaft. The fan blades indicated desired 'or' suitable nunr be readily recognized by those generally at 16 are prefer ably formed integral with the disk 12, there being provided any ber of blades and the blades and disk being mounted properly proportionedlforthe particular use for which the device is intended.

Itwill be seen from'Fig. 2 that each fanblade 16is curved outwardlyand'rearwardly from the portions-thereof nearest the axis of rotation of the disk, this construction providing a more powerful and aperfectly operating device than straight radial or in clined blades,'as heretofore in use.

Each of the blades 16 isformed with a for ward or contact surface 18 which, asshown,

. is formed with a plurality of stepped porportions of tions 20,.the successive stepped the contact surface being 'positioned' rearclearly indicated inFig. 2. The portions 20 are thus separated by inea ns of the steps 22. The stepped portions 20 extend substantially across the blades 16, the inner edge of each portion. 20 being curvedfforwardly adjacent the supporting disk 12 as indicated at 23, (see Fig. 4) thus continuing the stepped rclationto the disk but without the formation of objectionable pockets. 1

In operation the disk and attached blades are rotated at the desired relatively high speed in the direction of the arrow (Fig. 2) the force of the currents produced being suflicient to draw the materialfrom the mill, through the passage 9, and into the housing 8 and fan 11. The material passes into the tan adjacent the axis thereof, the outward currents of air and the contact'of this. material with the fan blades causing the'material to pass outwardly through the passage 10. Asthe material passes outwardly through the fan between the blades 16 it is brought forcibly into contact with the fan blades the stepped relation of which'prevents any continued contact between the fan blade and the material being advanced. This elimination of most of the direct contact is suflicient to .wardly ofeach radially inward section. as

a ally outwardly directed any outwardly directed blades, onits for-,wardface with a plurality of outmaterially reduce the power required and to insure longer life with those heretoforein use.

- WVhile we have shown and described certaiih speci 1c constructions as illustrations of our invention it will be understood that variations therefrom may be made so long as they fall 1 In a centrifugal advancing mechanism,

a rotatable fan formed lwith aseries of radiblades provided on their forward faces with steppedsurfacesl- 2. In a centrifugal advancing inechanisimy a rotatablefan formed with-Vaseriesof ra'di allyoutwardly directed blades provided on their forwardfaces with stepped surfaces,

said surfaces being steppedoutwardly and rearwardly with respect to oneanother.

3. In a centrifugal advancing mechanism,

a rotatablefan formed with a series .of radieach provided wardly and rearwardly stepped surfaces for tegrally with said blades and extending along one side edge thereofand ofsaidstepped surfaces forfsupporting the same.

4. Ina centrifugal fan, a rotatable blade the contact surface ofwhich is curved real wardly as :it extendsioutwardly, from the axis of rotation thereof,said blade :having difier ent portions of the contact surface thereof ofiset with-respect to other radially removed portionsofthe surfacethereof; I

,5. In a centrifugal v.fan,-,a rotatable blade for the I apparatus than including: elevated 'tatabl'e therewith,

'wardly, fIOHISald surfaceto a the forward surface'of which extends out-.

wardly and rearwardly from a point near the axis ofrotationthere'of, saidiforward surface and depressed portions providing a broken forward surface thereon.

6. Inacentrifugalifan,arotatable blade the forward surface of which extends outwardly, and rearwardly from a point near the axis of rotation thereof, said forward surface being separated into a plurality of outwardly and rearwardly spaced or stepped portions.

7. Inacentrifugal fan, ;a rotatable blade] the forward surface of which wardly and rearwardly from. a pointnear the axis of rotation thereof,

extends outc said forward surface being separated mtoa plurality ofoutwardly and rearwardly spacedor stepped ,portions,u

a rotatable disk secured to saidbladeand 'i'o the steps joining .said spaced or stepped portions extending forextent along said disk.

8. In an advancingmechanism, a-fan comprising a rotatable supporting base and a plurality of advancing 'members,- each formed with a series of contact surfaces positioned in stepped or offset relation for successive en- 7 gagement bythe materialbeing. advanced. the purposeset, forth anda diskforined ,m-

- faces, each seriesbeing formedwith radially predetermined separated, circuinferentially spaced contact portions, spaced successively; outwardly and Yrearwardly of one another. a

Signed at "Utica, in the county of Oneida a and State of New,York, August, YAVD; 1927.. y I

JOHN MuRsoI-r CHASE. SCHUTITE,

this 10th day of 

